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collapsable depth-0"><p class="sidebar-heading"><span>Vue</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Vue3</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>React</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Webpack</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Node.js</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>性能优化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>手写代码</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="面试官-dom常见的操作有哪些"><a href="#面试官-dom常见的操作有哪些" class="header-anchor">#</a> 面试官：DOM常见的操作有哪些？</h1> <p><img src="https://static.vue-js.com/a89c99a0-7fdc-11eb-ab90-d9ae814b240d.png" alt=""></p> <h2 id="一、dom"><a href="#一、dom" class="header-anchor">#</a> 一、DOM</h2> <p>文档对象模型 (DOM) 是 <code>HTML</code> 和 <code>XML</code> 文档的编程接口</p> <p>它提供了对文档的结构化的表述，并定义了一种方式可以使从程序中对该结构进行访问，从而改变文档的结构，样式和内容</p> <p>任何 <code>HTML</code>或<code>XML</code>文档都可以用 <code>DOM</code>表示为一个由节点构成的层级结构</p> <p>节点分很多类型，每种类型对应着文档中不同的信息和（或）标记，也都有自己不同的特性、数据和方法，而且与其他类型有某种关系，如下所示：</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Page<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span>Hello World!<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span> <span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p><code>DOM</code>像原子包含着亚原子微粒那样，也有很多类型的<code>DOM</code>节点包含着其他类型的节点。接下来我们先看看其中的三种：</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token attr-name">title</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>title<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        content
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span> <span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p>上述结构中，<code>div</code>、<code>p</code>就是元素节点，<code>content</code>就是文本节点，<code>title</code>就是属性节点</p> <h2 id="二、操作"><a href="#二、操作" class="header-anchor">#</a> 二、操作</h2> <p>日常前端开发，我们都离不开<code>DOM</code>操作</p> <p>在以前，我们使用<code>Jquery</code>，<code>zepto</code>等库来操作<code>DOM</code>，之后在<code>vue</code>，<code>Angular</code>，<code>React</code>等框架出现后，我们通过操作数据来控制<code>DOM</code>（绝大多数时候），越来越少的去直接操作<code>DOM</code></p> <p>但这并不代表原生操作不重要。相反，<code>DOM</code>操作才能有助于我们理解框架深层的内容</p> <p>下面就来分析<code>DOM</code>常见的操作，主要分为：</p> <ul><li>创建节点</li> <li>查询节点</li> <li>更新节点</li> <li>添加节点</li> <li>删除节点</li></ul> <h3 id="创建节点"><a href="#创建节点" class="header-anchor">#</a> 创建节点</h3> <h4 id="createelement"><a href="#createelement" class="header-anchor">#</a> createElement</h4> <p>创建新元素，接受一个参数，即要创建元素的标签名</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> divEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">&quot;div&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="createtextnode"><a href="#createtextnode" class="header-anchor">#</a> createTextNode</h4> <p>创建一个文本节点</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> textEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createTextNode</span><span class="token punctuation">(</span><span class="token string">&quot;content&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="createdocumentfragment"><a href="#createdocumentfragment" class="header-anchor">#</a> createDocumentFragment</h4> <p>用来创建一个文档碎片，它表示一种轻量级的文档，主要是用来存储临时节点，然后把文档碎片的内容一次性添加到<code>DOM</code>中</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> fragment <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createDocumentFragment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>当请求把一个<code>DocumentFragment</code> 节点插入文档树时，插入的不是 <code>DocumentFragment</code>自身，而是它的所有子孙节点</p> <h4 id="createattribute"><a href="#createattribute" class="header-anchor">#</a> createAttribute</h4> <p>创建属性节点，可以是自定义属性</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> dataAttribute <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createAttribute</span><span class="token punctuation">(</span><span class="token string">'custom'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
consle<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>dataAttribute<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="获取节点"><a href="#获取节点" class="header-anchor">#</a> 获取节点</h3> <h4 id="queryselector"><a href="#queryselector" class="header-anchor">#</a> querySelector</h4> <p>传入任何有效的<code>css</code> 选择器，即可选中单个 <code>DOM</code>元素（首个）：</p> <div class="language-js extra-class"><pre class="language-js"><code>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.element'</span><span class="token punctuation">)</span>
document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'#element'</span><span class="token punctuation">)</span>
document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'div'</span><span class="token punctuation">)</span>
document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'[name=&quot;username&quot;]'</span><span class="token punctuation">)</span>
document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'div + p &gt; span'</span><span class="token punctuation">)</span>
</code></pre></div><p>如果页面上没有指定的元素时，返回 <code>null</code></p> <h4 id="queryselectorall"><a href="#queryselectorall" class="header-anchor">#</a> querySelectorAll</h4> <p>返回一个包含节点子树内所有与之相匹配的<code>Element</code>节点列表，如果没有相匹配的，则返回一个空节点列表</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> notLive <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">&quot;p&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>需要注意的是，该方法返回的是一个 <code>NodeList</code>的静态实例，它是一个静态的“快照”，而非“实时”的查询</p> <p>关于获取<code>DOM</code>元素的方法还有如下，就不一一述说</p> <div class="language-js extra-class"><pre class="language-js"><code>document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'id属性值'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>返回拥有指定id的对象的引用
document<span class="token punctuation">.</span><span class="token function">getElementsByClassName</span><span class="token punctuation">(</span><span class="token string">'class属性值'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>返回拥有指定<span class="token keyword">class</span>的对象集合
document<span class="token punctuation">.</span><span class="token function">getElementsByTagName</span><span class="token punctuation">(</span><span class="token string">'标签名'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>返回拥有指定标签名的对象集合
document<span class="token punctuation">.</span><span class="token function">getElementsByName</span><span class="token punctuation">(</span><span class="token string">'name属性值'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 返回拥有指定名称的对象结合
document<span class="token operator">/</span>element<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'CSS选择器'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  仅返回第一个匹配的元素
document<span class="token operator">/</span>element<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">'CSS选择器'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   返回所有匹配的元素
document<span class="token punctuation">.</span>documentElement<span class="token punctuation">;</span>  获取页面中的<span class="token constant">HTML</span>标签
document<span class="token punctuation">.</span>body<span class="token punctuation">;</span> 获取页面中的<span class="token constant">BODY</span>标签
document<span class="token punctuation">.</span>all<span class="token punctuation">[</span><span class="token string">''</span><span class="token punctuation">]</span><span class="token punctuation">;</span>  获取页面中的所有元素节点的对象集合型
</code></pre></div><p>除此之外，每个<code>DOM</code>元素还有<code>parentNode</code>、<code>childNodes</code>、<code>firstChild</code>、<code>lastChild</code>、<code>nextSibling</code>、<code>previousSibling</code>属性，关系图如下图所示</p> <p><img src="https://static.vue-js.com/c100f450-7fdc-11eb-ab90-d9ae814b240d.png" alt=""></p> <h3 id="更新节点"><a href="#更新节点" class="header-anchor">#</a> 更新节点</h3> <h4 id="innerhtml"><a href="#innerhtml" class="header-anchor">#</a> innerHTML</h4> <p>不但可以修改一个<code>DOM</code>节点的文本内容，还可以直接通过<code>HTML</code>片段修改<code>DOM</code>节点内部的子树</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 获取&lt;p id=&quot;p&quot;&gt;...&lt;/p &gt;</span>
<span class="token keyword">var</span> p <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'p'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 设置文本为abc:</span>
p<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> <span class="token string">'ABC'</span><span class="token punctuation">;</span> <span class="token comment">// &lt;p id=&quot;p&quot;&gt;ABC&lt;/p &gt;</span>
<span class="token comment">// 设置HTML:</span>
p<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> <span class="token string">'ABC &lt;span style=&quot;color:red&quot;&gt;RED&lt;/span&gt; XYZ'</span><span class="token punctuation">;</span>
<span class="token comment">// &lt;p&gt;...&lt;/p &gt;的内部结构已修改</span>
</code></pre></div><h4 id="innertext、textcontent"><a href="#innertext、textcontent" class="header-anchor">#</a> innerText、textContent</h4> <p>自动对字符串进行<code>HTML</code>编码，保证无法设置任何<code>HTML</code>标签</p> <div class="language- extra-class"><pre class="language-text"><code>// 获取&lt;p id=&quot;p-id&quot;&gt;...&lt;/p &gt;
var p = document.getElementById('p-id');
// 设置文本:
p.innerText = '&lt;script&gt;alert(&quot;Hi&quot;)&lt;/script&gt;';
// HTML被自动编码，无法设置一个&lt;script&gt;节点:
// &lt;p id=&quot;p-id&quot;&gt;&amp;lt;script&amp;gt;alert(&quot;Hi&quot;)&amp;lt;/script&amp;gt;&lt;/p &gt;
</code></pre></div><p>两者的区别在于读取属性时，<code>innerText</code>不返回隐藏元素的文本，而<code>textContent</code>返回所有文本</p> <h4 id="style"><a href="#style" class="header-anchor">#</a> style</h4> <p><code>DOM</code>节点的<code>style</code>属性对应所有的<code>CSS</code>，可以直接获取或设置。遇到<code>-</code>需要转化为驼峰命名</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 获取&lt;p id=&quot;p-id&quot;&gt;...&lt;/p &gt;</span>
<span class="token keyword">const</span> p <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'p-id'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 设置CSS:</span>
p<span class="token punctuation">.</span>style<span class="token punctuation">.</span>color <span class="token operator">=</span> <span class="token string">'#ff0000'</span><span class="token punctuation">;</span>
p<span class="token punctuation">.</span>style<span class="token punctuation">.</span>fontSize <span class="token operator">=</span> <span class="token string">'20px'</span><span class="token punctuation">;</span> <span class="token comment">// 驼峰命名</span>
p<span class="token punctuation">.</span>style<span class="token punctuation">.</span>paddingTop <span class="token operator">=</span> <span class="token string">'2em'</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="添加节点"><a href="#添加节点" class="header-anchor">#</a> 添加节点</h3> <h4 id="innerhtml-2"><a href="#innerhtml-2" class="header-anchor">#</a> innerHTML</h4> <p>如果这个DOM节点是空的，例如，<code>&lt;div&gt;&lt;/div&gt;</code>，那么，直接使用<code>innerHTML = '&lt;span&gt;child&lt;/span&gt;'</code>就可以修改<code>DOM</code>节点的内容，相当于添加了新的<code>DOM</code>节点</p> <p>如果这个DOM节点不是空的，那就不能这么做，因为<code>innerHTML</code>会直接替换掉原来的所有子节点</p> <h4 id="appendchild"><a href="#appendchild" class="header-anchor">#</a> appendChild</h4> <p>把一个子节点添加到父节点的最后一个子节点</p> <p>举个例子</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span> <span class="token constant">HTML</span>结构 <span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;js&quot;</span><span class="token operator">&gt;</span>JavaScript<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>
<span class="token operator">&lt;</span>div id<span class="token operator">=</span><span class="token string">&quot;list&quot;</span><span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;java&quot;</span><span class="token operator">&gt;</span>Java<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;python&quot;</span><span class="token operator">&gt;</span>Python<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;scheme&quot;</span><span class="token operator">&gt;</span>Scheme<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">&gt;</span>
</code></pre></div><p>添加一个<code>p</code>元素</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> js <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'js'</span><span class="token punctuation">)</span>
js<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> <span class="token string">&quot;JavaScript&quot;</span>
<span class="token keyword">const</span> list <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'list'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
list<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>js<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>现在<code>HTML</code>结构变成了下面</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span> <span class="token constant">HTML</span>结构 <span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token operator">&lt;</span>div id<span class="token operator">=</span><span class="token string">&quot;list&quot;</span><span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;java&quot;</span><span class="token operator">&gt;</span>Java<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;python&quot;</span><span class="token operator">&gt;</span>Python<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;scheme&quot;</span><span class="token operator">&gt;</span>Scheme<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>p id<span class="token operator">=</span><span class="token string">&quot;js&quot;</span><span class="token operator">&gt;</span>JavaScript<span class="token operator">&lt;</span><span class="token operator">/</span>p <span class="token operator">&gt;</span>  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span> 添加元素 <span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>div<span class="token operator">&gt;</span>
</code></pre></div><p>上述代码中，我们是获取<code>DOM</code>元素后再进行添加操作，这个<code>js</code>节点是已经存在当前文档树中，因此这个节点首先会从原先的位置删除，再插入到新的位置</p> <p>如果动态添加新的节点，则先创建一个新的节点，然后插入到指定的位置</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> list <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'list'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token keyword">const</span> haskell <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'p'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
haskell<span class="token punctuation">.</span>id <span class="token operator">=</span> <span class="token string">'haskell'</span><span class="token punctuation">;</span>
haskell<span class="token punctuation">.</span>innerText <span class="token operator">=</span> <span class="token string">'Haskell'</span><span class="token punctuation">;</span>
list<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>haskell<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="insertbefore"><a href="#insertbefore" class="header-anchor">#</a> insertBefore</h4> <p>把子节点插入到指定的位置，使用方法如下：</p> <div class="language-js extra-class"><pre class="language-js"><code>parentElement<span class="token punctuation">.</span><span class="token function">insertBefore</span><span class="token punctuation">(</span>newElement<span class="token punctuation">,</span> referenceElement<span class="token punctuation">)</span>
</code></pre></div><p>子节点会插入到<code>referenceElement</code>之前</p> <h4 id="setattribute"><a href="#setattribute" class="header-anchor">#</a> setAttribute</h4> <p>在指定元素中添加一个属性节点，如果元素中已有该属性改变属性值</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> div <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'id'</span><span class="token punctuation">)</span>
div<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">'class'</span><span class="token punctuation">,</span> <span class="token string">'white'</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//第一个参数属性名，第二个参数属性值。</span>
</code></pre></div><h3 id="删除节点"><a href="#删除节点" class="header-anchor">#</a> 删除节点</h3> <p>删除一个节点，首先要获得该节点本身以及它的父节点，然后，调用父节点的<code>removeChild</code>把自己删掉</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 拿到待删除节点:</span>
<span class="token keyword">const</span> self <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'to-be-removed'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 拿到父节点:</span>
<span class="token keyword">const</span> parent <span class="token operator">=</span> self<span class="token punctuation">.</span>parentElement<span class="token punctuation">;</span>
<span class="token comment">// 删除:</span>
<span class="token keyword">const</span> removed <span class="token operator">=</span> parent<span class="token punctuation">.</span><span class="token function">removeChild</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">;</span>
removed <span class="token operator">===</span> self<span class="token punctuation">;</span> <span class="token comment">// true</span>
</code></pre></div><p>删除后的节点虽然不在文档树中了，但其实它还在内存中，可以随时再次被添加到别的位置</p> <h2 id="相关链接"><a href="#相关链接" class="header-anchor">#</a> 相关链接</h2> <p>https://developer.mozilla.org/zh-CN/docs/Web/API/Document_Object_Model</p></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">更新时间:</span> <span class="time">12/14/2021, 10:12:35 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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